The invention relates to the field of engineering vehicles, and particularly discloses a clutch operation device, an engineering vehicle and a gear shifting or reversing control method of the engineering vehicle. The clutch operation device comprises a clutch button arranged on a gear shifting operation rod, a shifting fork acting on a separation bearing of a clutch so that a friction plate of theclutch and the end face of a flywheel shell of an engine can be separated or move in the direction away from the separation bearing and be separated from the separation bearing, a linear drive component capable of driving the shifting fork to act, and a controller which is electrically connected with the clutch button and the linear drive component. The linear drive component, the clutch button and the controller replace a traditional clutch pedal, the clutch pedal does not need to be stepped on, the clutch button is pressed to achieve the effect that the movement speed of the linear drive component is controlled and not affected by operators, the combination and separation speed of the clutch is ensured, the service life of the friction plate is prolonged, and the comfort degree of the operators is improved.